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Video cameras concealed behind mirrors could help to personalise arcade video
games by allowing the machine to remember each player. Interval Research of Palo
Alto, California, proposes using a pair of video cameras behind a two-way mirror
to capture a 3D image of unsuspecting gamers (W0 99/6940). When they come back
to play again, the image is compared with recorded images. This, say the
inventors, lets a player pick up a game where they left off. But, they warn,
such technology could also be used to keep tabs on computer users.